Ultimate performing lightweight mortar protects against cracks. Offers the ultimate in bond strength for the most demanding installation requirements with the flexibility to withstand horizontal substrate movement. Formulated with CustomLite® technology, it's 40% lighter than other mortars, providing excellent handling characteristics, and offers non-sag, non-slip installation on walls. Diverse in application, it is capable of thin-set or medium-bed use up to 3/4" thick on horizontal surfaces after beat in. Non-slump, medium-bed features provide the ultimate support for large format tile and stone. Formulated with premium white cements and select recycled content for a white backdrop for the delicate installation of hard-to-bond glass tile. A 30 lb bag covers the same area as a 50 lb bag of traditional mortar. Use for interior or exterior floors, countertops and walls. Formulated with recycled material, contributes to LEED® certification.